Please help.

My doctor told me that I have depersonalization but it kind of feels like more than that? I'm not sure if this makes any sense. I'll have these episodes where I'm not here, this is not my body, this is not my plane of existence, my memories aren't mine and all of a sudden I was a crying mess. I'll look in the mirror and that's not me. I have this image in my head and that's not me something's off about that.

This has happened before but in different ways. Over the summer it was that I was living in a small part of my brain with no control over my body and it really sucked but I got past that episode.

This one that I've been having has lasted a couple weeks and it's really starting to scare me as it feels so different. I am unsure how to explain it but I feel like a ghost or that I've just been planted here ad that the world around me isn't real. I don't know what to do to help this and I know this sounds weird but it tends to happen a lot when I'm with my boyfriend. I'm also getting these splitting headaches, this ringing in my ears that just won't stop, and nausea. I'm on 100mg of Zoloft but my doctor wants me to go down because of my depression. I don't know what to do. Please help if you can.